UntilFireUntilFireHow much do you need to retire in Boulder, CO? Based on a local cost of living of $58,400/year — plausibly $56,200 to $59,700, your FIRE target is $1,460,000.
Using the 4% rule — the most widely used FIRE guideline — retiring in Boulder, CO requires a portfolio of $1,460,000. This assumes you'll spend $58,400 per year and withdraw 4% of your portfolio annually, which historical data suggests can sustain a 30+ year retirement.
Boulder, CO sits near the middle of UntilFire's US city range. That makes it useful for testing whether the real lever is spending discipline, tax efficiency, or simply earning more.
Boulder, CO residents face Colorado — 4.40% flat, so pre-tax contributions and a realistic take-home estimate matter. FIRE math breaks when people plan from gross salary instead of the amount they can actually invest.
The biggest levers are still your savings rate and your timeline. Saving 20% of take-home instead of 10% can cut years off the journey, and starting earlier lowers the amount your portfolio has to do later.
Updated September 17, 2026. All amounts are annual US dollars. Housing uses the US Census Bureau's American Community Survey median gross rent for recent movers, with the all-renter median used when the recent-mover figure is unavailable. Non-housing spending uses a $34,000national annual baseline. Together they produce the $58,400 planning estimate above.
The displayed range reflects renter medians and Census margins of error, so it is a starting point rather than a household budget. Replace it with your own spending in the calculator. The FIRE target applies the common 25× guideline; it does not guarantee that a portfolio will last.
Not everyone wants the same retirement. Here is how the main FIRE variants translate to Boulder, CO's $58,400/year cost-of-living baseline, so you can target the lifestyle you actually want.
Invest this by age 30 and growth alone (≈6.9% real) can reach full FIRE by 65 — no further contributions needed.
Portfolio covers roughly half of Boulder, CO's $58,400 annual spending; part-time work bridges the rest.
A leaner $40,880/year lifestyle in Boulder, CO (about 70% of the baseline), at the 25× rule.
The standard 25× target on Boulder, CO's $58,400 annual baseline.
A more comfortable $87,600/year lifestyle in Boulder, CO (about 1.5× the baseline).
Boulder, CO ranks by annual spending baseline among UntilFire's US cities, which helps explain whether your target is being pushed mostly by local costs or by your own spending choices.
The current UntilFire median US city baseline is $53,900/year. Every $1,000 of annual spending changes the 25× target by $25,000.
Nearest higher baseline: Alpharetta, GA at $58,500/year.
Nearest lower baseline: Tampa, FL at $58,100/year.
The quickest next step after a city baseline is pressure-testing your withdrawal-rate assumptions for Boulder, CO.
Open FIRE Number CalculatorThe honest answer to the most common retirement question — how to calculate your number, what variables actually move it, and how to stress-test your target.
Read the guideA simple baseline for Boulder, CO is $1,460,000, which comes from multiplying the local annual spending estimate of $58,400 by 25. That is a starting point, not a final answer: your housing, taxes, and personal spending rhythm still matter.
Boulder, CO sits about $4,500 above the current UntilFire median US city baseline of $53,900 per year, so spending control matters more than average here.
Boulder, CO uses Colorado — 4.40% flat, so pre-tax contributions and realistic take-home assumptions matter. Taxes do not change the 25x rule directly, but they do change how quickly you can fund it.
Lean FIRE in Boulder, CO — a leaner lifestyle at about 70% of the local baseline — works out to roughly $1,022,000. Fat FIRE, a more comfortable lifestyle at about 1.5× the baseline, is closer to $2,190,000. Standard (full) FIRE sits at $1,460,000, and Coast FIRE — the amount that can grow into full FIRE on its own by age 65 if invested by age 30 — is about $141,297.
Track your spending, model your investments, and see exactly when you can retire in Boulder, CO.
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